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Great Lakes fish feed on invading shrimp

Date:
November 22, 2011
Source:
Queen's University
Summary:
The latest invader of the Great Lakes -- Hemimysis anomala, or more commonly the bloody red shrimp after its bright red spots -- may become a new food source for fish, allaying concerns about how it will impact native fish populations.
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The latest invader of the Great Lakes -- Hemimysis anomala, or more commonly the bloody red shrimp after its bright red spots -- may become a new food source for fish, allaying concerns about how it will impact native fish populations.

"Forecasting how an invader will affect the growth and production of a specific native fish species is very relevant to conservation groups and government agencies hoping to conserve those fish," says Biology graduate student Mike Yuille.

Mr. Yuille is the lead author of a study that suggests for the first time that several native fish species have incorporated the bloody red shrimp into their diet over a multi-seasonal period.

In addition to using traditional stomach content analyses, researchers measured the carbon and nitrogen signatures of muscle tissues of three potential Hemimysis predators (round goby, yellow perch, and alewife) to get a long-term picture of eating habits. All three predators exhibited increased nitrogen or carbon signatures, suggesting they had been feeding on prey with signatures very similar to Hemimysis. The team found these signatures in sites with dense populations of bloody red shrimp.

Like zebra mussels, Hemimysis anomala is native to the Black Sea and Caspian Sea. It probably arrived in the Great Lakes through the ballast water of transoceanic ship. In 2006 it was discovered in Lake Michigan and has now been found in all of the Great Lakes except Lake Superior.

Mr. Yuille co-authored the research with Queen's associate professor Shelley Arnott, Linda Campbell, and Timothy Johnson at the Ontario Ministry of Natural Resources' Glenora Fisheries Station in Picton.

These findings will be published in the Journal of Great Lakes Research.


Story Source:

The above post is reprinted from materials provided by Queen's University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael J. Yuille, Timothy B. Johnson, Shelley E. Arnott, Linda M. Campbell. Hemimysis anomala in Lake Ontario food webs: Stable isotope analysis of nearshore communities. Journal of Great Lakes Research, 2011; DOI: 10.1016/j.jglr.2011.11.005

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Queen's University. "Great Lakes fish feed on invading shrimp." ScienceDaily. ScienceDaily, 22 November 2011. <www.sciencedaily.com/releases/2011/11/111122143358.htm>.
Queen's University. (2011, November 22). Great Lakes fish feed on invading shrimp. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2011/11/111122143358.htm
Queen's University. "Great Lakes fish feed on invading shrimp." ScienceDaily. www.sciencedaily.com/releases/2011/11/111122143358.htm (accessed September 4, 2015).

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